[PATCH] riscv: Report error when repeatedly recording CPU hardware ID

[Zhe Qiao]

In the of_parse_and_init_cpus() function, when the __cpuid_to_hartid_map[]
array records the CPU hardware ID, if the same CPU hardware attribute has 
been recorded, an error report is issued, thereby ensuring the uniqueness
of the CPU hardware ID recorded in the __cpuid_to_hartid_map[] array.

Signed-off-by: Zhe Qiao <qiaozhe at iscas.ac.cn>
---
 arch/riscv/kernel/smpboot.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 0f8f1c95ac38..698f9fe791f7 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -118,6 +118,16 @@ static void __init acpi_parse_and_init_cpus(void)
 #define acpi_parse_and_init_cpus(...)	do { } while (0)
 #endif
 
+static bool __init is_mpidr_duplicate(unsigned int cpuid, u64 hart)
+{
+	unsigned int i;
+
+	for (i = 1; (i < cpuid) && (i < NR_CPUS); i++)
+		if (cpuid_to_hartid_map(i) == hart)
+			return true;
+	return false;
+}
+
 static void __init of_parse_and_init_cpus(void)
 {
 	struct device_node *dn;
@@ -131,6 +141,12 @@ static void __init of_parse_and_init_cpus(void)
 		if (rc < 0)
 			continue;
 
+		if (is_mpidr_duplicate(cpuid, hart)) {
+			pr_err("%pOF: duplicate cpu reg properties in the DT\n",
+				dn);
+			continue;
+		}
+
 		if (hart == cpuid_to_hartid_map(0)) {
 			BUG_ON(found_boot_cpu);
 			found_boot_cpu = 1;
-- 
2.43.0